<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
    .outer {
        width: 100%;
        height: 200px;
        display: flex;
        justify-content: space-evenly;
        align-items: center;
    }
    .side {
        width: 100px;
        height: 100%;
        background-color: red;
    }
    .mid {
        height: 100%;
        flex: 1;
        background-color: blue;
    }
</style>
<body>
<div class="outer">
    <div class="side"></div>
    <div class="mid"></div>
    <div class="side"></div>
</div>
</body>
</html>
